In a post seen by more than 5,000 people, a supporter of the so-called Islamic State said the famous "heart" on the surface of Pluto was actually a message written in the style of the 'I heart New York' t-shirts.

The unnamed writer said two Arabic words could be spotted on either side of the heart.

"When we look carefully at this photo of Pluto, we will notice an Arabic sentence which means Allah loves Mohammed," the ISIS propagandist claimed.

"Since the heart is so big, that means 'so much love or 'God loves Mohammed so much'.

"These were made by God almighty on the surface of Pluto."

The Islamic State astronomer also claimed to have seen the Arabic word for Mohammed in NASA close-up photographs showing the surface of Pluto and Charon, one of its moons.

He said the moon Hydra was the same shape as Mohammed's name - and questioned why the American space agency didn't release more detailed pictures.

"I would ask NASA: Why isn't the photo clear?"

A NASA photo of Hydra, one of Pluto's moons (Photo: NASA/PA)

After presenting his arguments, the ISIS supporter then concluded:

"I would suggest to NASA to change the name of this moon to: The Moon of Mohammad."

The writer of the Pluto post appears to be the same man behind a series of stories which imagine American celebrities converting to Islam.

In one piece of fiction which has now been shared by more than 70,000 people, both Katy Perry and Justin Bieber become Sunni Muslims.

Written in a question and answer style, the story depicts Perry raising questions about which religion is the best to follow.

But Bieber has no such doubts and shows his bright-haired friend a series of videos offering "scientific evidence for the truth of Islam".

"WAAAW!" the fake Katy Perry said after listening to Bieber's proseltzysing.

"What amazing links. I watched all of them without feeling the passage of time.

"To obtain salvation in the hereafter, be a practicing pious Sunni Muslim."